policy on when drone attacks may be used against u.s. citizens abroad. specifically the white paper's focus is on who may be the focus of these attacks and at what point a threat is considered imminent. for more we bring in the man who broke this story, the great nbc's mike isikoff. mike, welcome. let's make it clear, if he can, from the beginning, whom does this memo encompass? for instance, would it include an al qaeda agent, say, living in europe, in germany, or in the united kingdom? >> most likely not. the memo lays out a three-part test for who can be targeted by a pilotless drone strike if there is a belief that the individual, the target, is an al qaeda operational leader. number one, there has to be what the memo describes as an imminent threat of a violent attack against the united states. number two, capture of that individual is not feasible. and number three, the operation has been under applicable law of war principles. if you go to the second part of that test, capture is unfeasible, it probably wouldn't apply in germany or the united king